Integrated: 8346044: GenShen: ShenandoahGenerationalHeap entry missing from Universe.java

[William Kemper]

Looks the genshen backport/merge missed this one.

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Commit messages:
 - Add shenandoah generational heap to type DB

Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/144/files
  Webrev: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=144&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8346044
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/144.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/144/head:pull/144

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/144